Heat exchanger



Nov.26,1929. .EHAB R 1;,737,1s9

HEAT EXCHANGER Filed Nov. 11, 1924 In vemo/ Patented Nov. *26, 1929 i PATENT OFFICE EUGEN HAIBER, F BERLIN-CHARLOTTENBURG, GERMANY HEAT EXCHANGE-R Application filed November 11, 1924, Serial No 749,284, and in Germany 0ctober 81/1923.

This invention relates to heat exchange devices of that type which comprises a group of elements being composed of steel plates in such a manner that passages for a heating fluid and transverse passages for a fluid to be heated are formed, and flanges are provided framing the open sides'of the elements.

The, object of this invention is to improve the construction of air heating lants in such a manner that a correct regu ation of the temperatures of the two fluids at the discharge end of the plant is obtained by means of regulating devices mounted in both the admission and delivery flues for both the hot gases and the air. The heater comprises a group of elements built into the flue gas channel, so that the free cross section for the pas sage of the fluids and consequently the individual speed of said fluids may be controlled,

the diflerent regulating devices being pref erably connected with one another by special auxiliary means, the tubular inflow and dis- L charge conduits for the fluids being fitted with blowers in order to ensure the desired speeds of the fluids. The air which acts as cooling means may be conducted once or several times through the heat exchanging bodies.

An embodiment of the invention is shown,

. by. way of example, on the accompanying drawing, in wh1ch:

Fig. 1 shows in front elevation 'a heat exchange device composed of four elements.

Fig. 2 is a side elevation viewed from the left, the tubular connecting pieces 4 and 6 being removed.

Fig. 3 shows a modified form of the apparatus.

Fig. 4 is a side elevation of Fig. 3, partly in section.

As shown in Fig. 1 the heat exchange device consists of four heat exchanging elements 1 of the type described and shown in my prior Patent No. 1,635,835, .filed February 3, 1922, said four elements being superposed in pairs and connected with one another in. a convenient manner. The flue gases are admitted through channel'2 and flow through the elements from below upward to escape into the chimney through the tubular socket 3 at the upper end of the device. The air to be heated is conducted in horizontal direction through the air-heater preferably according to the counter-current principle. With this object in view the air is admitted through the tubular inlet 4 and after having traversed the upper group of elements it is conducted through the return bend 5 into the lower group of elements from which it flows out through the tubular outlet 6 With which the distributing pipe 7 is connected. I

In thegas inlet channel 2 two shafts 8 are journalled which carry each an: adjusting damper 9 extending over the entirewidth of the channel and being'of such a height that each damper is capable of closing an outer group of fluechannels or so that both dampers together will close the middle group of flue channels. The free outer ends of the shafts 8 carry gear wheels meshing with one another or coupled in any convenient manner in order to ensure a uniform movement of the adjusting dampers 9. Similar adjusting dampers 12 are preferably arranged in the outflowv channel for the flue gases the axles 13 of these dampers 12 having keyed on their outer free ends gear wheels 14 which are coupled orconnected in any convenient manner with the gear wheels 11 so that a uniform simultaneous movement of the upper and lower adjusting dampers is ensured.

In the section shown in Fig. 2 the adjusting dampers are at the median position so that the flue gases can freely pass through all the flue gas channels.

When these adjusting dampers are turned outwardly toward the walls of the-flueinto a horizontal position they will close the outer groups of flue channels, so that the flue gases can freely pass through the median group of channels only. Not only the velocity of flow of the flue gases but also the' degree of efliciency of the heat exchanging elements is influenced in this manner so that the temperature of the outflowing flue gases can be regulated accordingly; Thedegree of eificiency is further varied, when the adjusting dampers are turned so that the median group of flue channels is closed.

As shown in Figs. 3 and 4 the final temperatune of the flue gases may further be regulated by additional regulating means. With this object in view the two groups 30 and 31 of the air heating plant each consisting of four heat exchanging elements are separated from one another by a flue gas channel 32 i which serves to connect the main flue with outflow tubes 40 and 41 are further connected the stack or chimney. In this connecting channel swivel dampers 33 are arranged. Separate flue gas channels 34, 35 are arranged for the two groups of elements 30, 31, these admission channels being-situated at either side of the flue channel 32 and adapted to be shut off by regulating dampers 36, 37.

These regulating dampers 36, 37 are mounted on parallel axles 38 and connected the-one with the other by means of a continuous rod 48. On the one outer axle 38 a hand-lever 51 -is fixed, to which the outer adjusting lever 39 is hingedly connected, by the operation of which all thedampers 33,

36 and 37 can be adjusted at the same time.

On the 'upper elements of each group tubular outlets 40, 41 are mounted which terminate in the casings 42 of the suction-draft-fans. The

by'tubular connections 43. and 44 with the flue-gas-channel 32. The overflow orifices are controlled by adjusting dampers 45, 46 respectively which are adapted to shut ofl selectively the orifices of the outflow-tubes 40 and 41 and the inlet orifices of the tubular connections 43 and 44, but'which may be adjusted. also to intermediate positions, in case only a portion of the flue-gases has to pass through the groups of heat-exchanging-elements. The axles of the adjusting dampers 45 and 46 might be connected to the axles 38 or to the corresponding lever system in order to make possible a common adjusting. When the dampers 45 and 46 are in the position shown in Fig. 3' the main gas-channel 32 is certain angle, the dampers 36 and 37 are closed a similarangle, and a portion of the flue gases flows directly through the channel 32 and tubular connections 43 -and 44 to the suction-casings 42. When the shafts 38 are rotated 90- the admission of theflue-gases to the group 30 and 31 of heat exchangingelements is comparatively shut oil, and all the flue-gases escape through the flue-channel 32 into the chimney, as the dampers 45 and .hub of the other damper and adapted to be adjusted with regard to the other damper by means of an adjusting spindle having double threads and guided in rotatable nuts on said two damper-elements. While the gases are flowing in the direction 57 from below upward through the air-heater the fresh air to be heated is forced through transversely to the gas flow in the direction of the arrows 56...; The fresh air sucked in by the fan 53 is forced first through the admission-tube 52 through the upper rows of thetwo groups 30 and 31 and thence through the curved two connecting tubes 54 to the lower row of heat exchanging elements to be discharged through the tubular socket 55 to which the distributing pipe is connected.

1. A heat exchanging device consisting of a group of elements inserted in the path of the heating medium, means for throttling the heating medium at the entrance and at the exit in order to regulate the cross section of passages, means for throttling the cooling medium at the entrance and at the exitin order to regulate the cross section of passage, and auxiliary means for coupling said throttling means in pairs.

2. A heat exchange devicecomprising a group of elements, passages for a heating fluid and passages for a fluid to be heated in said elements, means to connect the said elements, including return bends for changing the direction of fluid flow through the elements, dampers at the inlet and at the outlet of the group of elements for controlling the flow of the heating fluid, means connecting the said dampers, inlet and outlet dampers for the fluid to be heated and means for con necting the said last mentioned dam er's.

" 3.. A heat exchanging device worklng with cross currents comprising in combination with the flue gas channel and with two branch flue gas channels at-either side of said main channel, a plurality of heat exchanging elements arranged in two groups'one at'either side of said main channel and above said a branch channels, coupled throttling dampers. for the cooling medium on the admission and discharging orifices of said grou s of heat exchanging elements, shutting oflf ampers in the main channel, throttling dampers in the two branch channels, means for simultaneously operating said shutting oil? and throttling dampers, tubular connections be- .tween the upper closed end of said main 'as channel and each branch channel, throttlmg dampers on said branch channels rotatably 46 have completely liberated the tubular conmounted near the admission point of said tubular connections and adapted to regulate the quantity of flue gas from said main as channel with regard to the quantities of no gas from said branch channels for regulatin the end temperatures of the two medii, an fans for conveying both medii. In testimony whereof I affix my signature.

EUGEN HABER. 

